Pressing Ctrl Alt 0 is not working for me
Press Ctrl+Alt+Numpad 0. It's important to use the Numpad 0 not the normal 0 on the upper key row.
If you don't have a number pad you can press F3 to open a search box (or Space - depends on preferences that you have set). There, search for the command 'align active camera to view'. Ctrl+Alt+Numpad 0 is the shortcut for it and listed there, too.